Multiple Choice
A 4.50-mg sample of a newly discovered radioactive nuclide was analyzed and found to contain only 3.25 mg after a period of 25.9 h.What is the half-life of the nuclide?
A) 75.0 h
B) 55.2 h
C) 73.5 h
D) 11.4 h
E) 18.9 h
Correct Answer:

Verified
Correct Answer:
Verified
Q40: What is the mass defect of <sup>11</sup><sub>4</sub>Be?<br>Particle<br>Mass
Q41: What quantity of energy is released per
Q42: When the radioactive nuclide <sup>62</sup>Zn undergoes electron
Q43: A particular nuclear bombardment reaction is represented
Q44: When a nucleus undergoes radioactive decay,its new
Q46: A sodium nucleus, <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB2288/.jpg" alt="A sodium
Q47: A radioactive isotope undergoes decay by emission
Q48: Which of the following statements is true?<br>A)As
Q49: What is the percent activity of a
Q50: A Geiger counter measures radiation by detecting<br>A)cations